应用于激光等离子体实验的脉冲展宽分幅相机

深圳大学物理与光电工程学院,广东深圳 518060

超快诊断; X射线分幅相机; 脉冲展宽; 时间分辨率; 空间分辨率; 增益均匀性; 激光等离子体

Development of pulse-dilation framing camera for laser-plasma experiment
LEI Yunfei, LIU Jinyuan, CAI Houzhi, WANG Dong,HUANG Junkun, WANG Yong, and DENG Pokun

College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China

ultrafast measurements; X-ray framing camera; pulse-dilation; temporal resolution; spatial resolution; gain uniformity; laser-plasma

DOI: 10.3724/SP.J.1249.2021.05453

备注

研制基于脉冲展宽技术的行波选通X射线分幅相机,光电阴极加载偏置-3 kV的直流电压和斜率2.7 V/ps的斜坡电脉冲,微通道板微带上加载-483 V的直流偏置电压和半高宽度290 ps的选通电脉冲,电子图像成像比例为1:1.利用激光器轰击金靶材产生短X射线均匀照明相机微带阴极,测得相机时间分辨率约为20 ps,在微带阴极长度小于20 mm范围内,相机增益均匀性优于20%; 采用直流紫外光对相机的静态空间特性进行标定,在相机成像面直径小于56 mm范围内,空间分辨率测量值为10 lp/mm.
We develop a traveling wave gated X-ray framing camera based on electron beam pulse-dilation technology. The photocathode is loaded with a direct current(DC)bias of -3 kV and a widening pulse with a slope of 2.7 V/ps, and the microchannel plate biased at -483 V superimposed a negative high voltage gated pulse with full width at half maximum(FWHM)of 290 ps. The imaging ratio of the camera is 1:1. Laser acts on a gold target to generate X-rays for uniform irradiation on the cathode. The temporal resolution of the camera is 20 ps and the gain uniformity of 20 mm cathode strip is better than 20%. The measured value of spatial resolution through a DC ultraviolet light source is 10 lp/mm in the range of imaging surface with a diameter of 56 mm.
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